import CarPlay
import UIKit

/**
 * CarPlay scene delegate for KRYZ Go!
 *
 * Shows a CPListTemplate with the KRYZ Live Stream item. Tapping it triggers
 * playback via AppDelegate.invokePlay(), then presents CPNowPlayingTemplate.
 *
 * CarPlay enforces its own design system for safety — colors cannot be customised.
 * The app icon (which carries the KRYZ brand orange) is used as item artwork to
 * provide visual continuity with the phone app.
 *
 * Note: the com.apple.developer.carplay-audio entitlement must be enabled in the
 * Apple Developer Portal and added to the target in Xcode Signing & Capabilities.
 */
@available(iOS 14.0, *)
class CarPlaySceneDelegate: UIResponder, CPTemplateApplicationSceneDelegate {

  private var carPlayInterfaceController: CPInterfaceController?
  private var listTemplate: CPListTemplate?

  // MARK: - CPTemplateApplicationSceneDelegate

  func templateApplicationScene(
    _ templateApplicationScene: CPTemplateApplicationScene,
    didConnect interfaceController: CPInterfaceController
  ) {
    carPlayInterfaceController = interfaceController
    interfaceController.setRootTemplate(makeListTemplate(), animated: false, completion: nil)
  }

  func templateApplicationScene(
    _ templateApplicationScene: CPTemplateApplicationScene,
    didDisconnectInterfaceController interfaceController: CPInterfaceController
  ) {
    carPlayInterfaceController = nil
    listTemplate = nil
    appDelegate?.invokeStop()
  }

  // MARK: - Template construction

  private func makeListTemplate() -> CPListTemplate {
    let artwork = CPListItem.maximumImageSize
    let icon = UIImage(named: "AppIcon")?
      .withRenderingMode(.alwaysOriginal)

    let item = CPListItem(
      text: "KRYZ Live Stream",
      detailText: "KRYZ Radio",
      image: icon
    )
    item.handler = { [weak self] _, completion in
      self?.handleStreamItemTapped()
      completion()
    }

    let section = CPListSection(items: [item])
    let template = CPListTemplate(title: "KRYZ Go!", sections: [section])
    template.tabTitle = "KRYZ Go!"
    template.tabImage = icon

    listTemplate = template
    // Silence unused-variable warning
    _ = artwork
    return template
  }

  // MARK: - Playback

  private func handleStreamItemTapped() {
    appDelegate?.invokePlay()
    carPlayInterfaceController?.pushTemplate(
      CPNowPlayingTemplate.shared,
      animated: true,
      completion: nil
    )
  }

  // MARK: - Helpers

  private var appDelegate: AppDelegate? {
    UIApplication.shared.delegate as? AppDelegate
  }
}